arduino-LoRa

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I used the LoRa Receiver Callback example and changed only the operating frequency and pins using setPins shown in the code below. I connected DIO0 to pin PA3/PCINT3, SS to PA0/PCINT0 and RESET to PB3/PCINT11.

I hooked up an oscilloscope to the DIO0 pin and can see it get pulled high the moment a message is received, however the onReceive callback is never called. I can confirm this by hooking the oscilloscope to the TX/PA1/PCINT1 pin. I have tried other things like driving a pin high to light up an LED ect, but nothing seems to work.

I am not sure if the ATtiny 84/85 are supported at all, but everything else seems to work fine except this. I really want to get it working if possible 🥲.

#include` <SPI.h>
#include <LoRa.h>
#ifdef ARDUINO_SAMD_MKRWAN1300
#error "This example is not compatible with the Arduino MKR WAN 1300 board!"
#endif
#define SS 0
#define DIO0 3
#define RESET 11

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.println("LoRa Receiver Callback");
  LoRa.setPins(SS, RESET, DIO0);
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  // Uncomment the next line to disable the default AGC and set LNA gain, values between 1 - 6 are supported
  // LoRa.setGain(6);

  // register the receive callback
  LoRa.onReceive(onReceive);

  // put the radio into receive mode
  LoRa.receive();
}

void loop() {
  // do nothing
}

void onReceive(int packetSize) {
  // received a packet
  Serial.print("Received packet '");

  // read packet
  for (int i = 0; i < packetSize; i++) {
    Serial.print((char)LoRa.read());
  }

  // print RSSI of packet
  Serial.print("' with RSSI ");
  Serial.println(LoRa.packetRssi());
}

As far as I can see, in AtTinyCore, digitalPinToInterrupt will return NOT_AN_INTERRUPT for any pin except CORE_INT0_PIN, which PIN_B1.

#define CORE_INT0_PIN  PIN_B1
#define digitalPinToInterrupt(p) ((p) == CORE_INT0_PIN ? 0 : NOT_AN_INTERRUPT)

So by using PA3 your request to attach an interrupt is probably kicked to the curb. Try to use PIN_B1.